Meh, it's unbelievable that Truth didn't know (or at least
suspect) that he was a Secret in human form.
I still don't understand why the hell he kidnapped Naru in the first place. She has basically become his nemesis since she wants the Scub Coral to absorb all of humanity, while Truth wants to eradicate the Scub and restore the "correct" world.
Even more aggravating is the thought that Truth had no means to reach his goal until the Quartz Gun appeared. His character is really ruining the series for me.
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Tibi, magnum Innominandum,
signa stellarum nigrarum
et bufaniformis Sadoquae sigilim.
(De Vermis Mysteriis)